In an approach for adaptive sampling of smart meter data, a computer retrieves one or more balancing constraints associated with one or more smart meter sensors. In another embodiment, personal data capturing functionality is integrated into a wireless communication device or a portable computing device by attaching a personal data capture device to the wireless communication device or the portable computing device. An actuating element outside the housing is connected to the body for shifting same between its positions. A first engagement notch is formed on two lateral portions of each of the first extended tabs. The photographing device can take a two-dimensional image without the unit and can function as a light receiving portion in three-dimensional measurement to conduct three-dimensional measurement in cooperation with the attached three-dimensional measurement auxiliary unit.